Improved process of obtaining useful oil from the acid residuum of petroleum



' United States No. 43,157 were granted to mysaid resiclnum,or .ofirlepriving .itof its. dis:

purposes in the arts.

'to have mixed .with

'gallons'of water.

'After having thus UNITED STATES PATENT OFFICE.

ALUNZO raiumn, or LONGWOOD, MASSACHUSETTS.

' IMPRQVD PROCESSOF OBTAINING USEFUL OlL FROM THE ACID RESIDUU'M 0F PETROLEUM.

Specification limping lh'll' P L ffl- Patent l\*o 96,097, dated Qclober-Zd,1569.v

Toall whom it may concern: Be it known that I, ALONZO FARRAR, of Longwood, in the county of Norfolk and State of Massachusetts, have made a new and useful invention or process of treating the oi1'derived from the purification of sulphuric acid after having been used inirefiniug petroleum and I do hereby declare the same fro-be de scribed as follows: I

On June 14, 1864, Letters-Patent ,of'the self and Robert :G. Loftus for a process of' removingjthe sulphuric acid in refining petroleum. In treating the said acid by the said patented process there is an oil y'residuum left, which has an odor so offensive as'to renderfelt of little or no practical value, the said odor being a bar to its use in the arts. 1- have discovered a method of utilizing the 'it about forty per agreeable odor, and of improving it in such manner as to render it fit for use for several It is especially useful nrnia'king liquid paints or printers ink. i I In'carrying out the said process or inven- 1 tion a quantity-of the said residuum sayl onehundred gallons-is to be taken, and is it from one to two-gallons of a solution of caustic soda of about 15 Baume. The mixture should bethoroughly agitated, and afterward be allowed to settle. Next the mixture drawn off or separated from the impurities left by the alkaline solution is to be put into a still'or open kettle, and with it there should be incorporated about twentypounds of lime and about'ten i Heat should be applied'to the still or kettle, so as to put the mixture in ebullition ;%nd ;distill off or evaporate from it more or-"le'ss of the water, which will carry off. the offensive matters set free by the lime. treated the substance in the kettle or still, or having reduced it to I it shouldbe allowed to settle, and should be or otherwise the proper consistency, the im purities left in ment of lime only, as there may be other matters or alkalines which may have an equivalent cllect or effects when used with the water and heat; nor do I confine myinventionto fining oil, as described in Letters Patent No. I "37,918, dated March 1-7, 1863, and reissued May 19, 1863. This, thoughin some respects analogous to myprocess, differs materially from it in others. In' the-first place his process relates to the oil containing the spent acid, whereas ;.-my processhas reference to after pressing the oil from the spent acid by the process described in. Letters Patent No."43,157. Millochan heats the oil by simply mixing with cent. of water and agitating the mixture for about two hours, such being to remoye the acid, after which he allows the liquidtfo settle, and subsequent-- ly draws off the water .and acid, after which be mixes with the oily portion about twenty per cent. of caustic soda oralkali' and stirs or shakes the whole mass for about an hour.- The remaining acid will then have been neutraliz'ed. tle for twelve hours. after which the super nataut oil is drawn off. He states that during the operation the oil may be exposed ma moderate steam or other heat, which will improve it. In no respect does he resort to a process ofdistillation to evaporate the water and carry off the offensive matters set free by the al-- I kali. [While he employs a moderate steam or other heat, I heat the liquid mass to ebullition, and keep it so until I evaporate from 1t the water, and by the steam produced carry off the. offensive odorous matters set free by the lime. Thus I' deodorize the oily matter, which he does not,

claim- 1. My' new .process, substantially as described, for treating the oily residuum obtained in the purification of the spent acid, as above mentioned. 2. As a new or'iinproved manufacture, the deodorized oily product resulting from the employment of such process, in manner as setforthj. v

- p ALONZO FARRAR;

Vitnesses: I

-R. H. EDDY,

S. N. PIPER.

The liquid isnext allowed to set 

